Originally Posted by jayhawker

I posted this question over on Honda-Tech and they said the K20 from the Si should drop right in. I guess that's what going in when the battery pack decides to go.

Originally Posted by livvie

For the HCH I...you would need to:

1. You would need to remove the rear battery pack.
2. Swap out the engine with regular civic.
3. Add an alternator
4. Swap out the AC compressor (with Civic regular version)
5. Swap out the transmission (assuming you have CVT)
6. Swap out gas tank…I think the regular version is slightly bigger.
7. Swap out steering electric motor. Not sure if regular had electric steering.
…

----
Minor stuff

1. replace all the glass with regular civic glass
2. remove the rear wing lip
3. remove front air dam
4. Paint the side mirrors black
5. Paint side door moldings black
6. Replace alloy wheels with regular steel wheels and hub cap.
7. Relocate antenna (not in the middle on regular civic)
8. Replace the rear bench seat with a fold down seat.
...
---

I'm sure there is more…not sure how far you want to go to make it a civic.

Originally Posted by Harold

Remember these cars do not have alternators, so the electric motor charges the engine battery as well as the pack. As long as the battery is being charged and the engine and lights work you should be able to go.I would not remove anything!Hal